Well, to keep the long story short,
He was confident that 17 would be in the game but 17 ended up being a partner of Android 18 so he was upset about it. What don't help the matter is people are egging on him because people found him rather annoying when he kept shut down some people's opinions about Android 17 in the past, so it's pretty much vindication for those 17 naysayers.
It got to the point that a moderator had to come in and tell them to knock it off, so he stick with DBS thread over there in Off Topic section and never step in any DBFZ threads in Gaming section ever since.
I feel bad for him because Android 17 being a partner to Android 18 is pretty much slap in the face moment for him.